Polyketone resin composition having excellent gas barrier properties

Abstract

The present invention relates to a polyketone copolymer consisting of repeating units represented by general formulae (3) and (4) below, and a mixture composition thereof. The present invention has excellent has barrier properties and thus can be used for vehicle fuel tanks, vehicle hydrogen tank liners, sealed food containers, etc.—(CH2CH2—CO)x—  (3)—(CH2CH(CH3)—CO)y—  (4)(wherein x and y denote the mol % of each of the general formulae (3) and (4) in a polymer).

Description

TECHNICAL FIELD[0001]The present invention relates to a polyketone resin composition having excellent gas barrier properties, and relates to a polyketone resin composition that can be used as a vehicle fuel tank, a vehicle oil pan, a vehicle hydrogen tank liner, a sealed food container, and etc.BACKGROUND ART[0002]Polyketone polymers, which are linear alternating copolymers of carbon monoxide and olefinically unsaturated compounds, have high stability in presence of hydrocarbon liquids. The polyketone polymer is excellent in gas barrier properties and can be used as a vehicle fuel tank, a vehicle oil pan, a vehicle hydrogen tank liner, a sealed food container, and etc.[0003]A molding technique using engineering plastics as a material for storing liquid for vehicle fuel is described in U.S. Pat. No. 4,965,104. Examples of the techniques include blow molding, rotational molding, vacuum molding, injection molding and extrusion.[0004]In order to produce a typical fuel tank, it is common...

AI Technical Summary

Benefits of technology

The present invention relates to a polyketone resin composition that exhibits excellent gas barrier properties and is suitable for use in various applications such as vehicle fuel tanks, oil pans, and sealed food containers. The polyketone is a linear alternative structure with unsaturated hydrocarbon per molecule comprising carbon monoxide. The polyketone is produced using a manufacturing method that involves copolymerizing carbon monoxide and ethylenically unsaturated hydrocarbon or a terpolymer of carbon monoxide, ethane, and another ethylenically unsaturated hydrocarbon. The polyketone has a number of suitable ethylenically unsaturated hydrocarbon of 20 or less and preferably 10 or less carbon atoms. The polyketone has a molecular weight measured by gel penetration chromatography of 100 to 200,000, and an average molecular weight of 10,000 to 90,000. The polyketone has physical properties that are determined by the molecular amount and the type of second hydrocarbon. The polyketone can be produced using a liquefied polymerization method using a catalyst composition comprising carbon monoxide, olefin palladium compound, acid of 6 or less pKa, and bidentate ligand compound of phosphorus. The palladium compound used in the catalyst composition can be acetic acid palladium. The amount of palladium compound used in the catalyst composition is preferably 10-3 to 10-11 mole. The amount of bidentate ligand compound of phosphorus used in the catalyst composition is preferably ((2,2-dimethyl-1,3-dioxane-5,5-diyl)bis(methylene))bis(bis(2-methoxyphenyl)phosphine). The amount of palladium used in the catalyst composition is compared to the amount of bidentate ligand compound of phosphorus and the amount of acid used in the catalyst composition is preferably 10-30 to 10-50 mole. The polyketone resin composition produced using this method exhibits excellent gas barrier properties and is suitable for various applications such as vehicle fuel tanks, oil pans, and sealed food containers.

Problems solved by technology

Therefore, if disassembled and liberated fragments block a fuel engine, there is a problem that a fuel supply may be interrupted.

However, conventional resins including HDPE, polyamide, polypropylene, and polyethylene still do not have enough gas barrier properties for use as vehicle hydrogen tank liners.

There is a problem such as a proper pressure in a tank can not be maintained when a gas barrier properly of the hydrogen tank liner is not enough, thereby failing to properly perform its role as a vehicle hydrogen tank.

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